The Saisentan is a special kodachi with its blade forged from the strongest form of metal and it conceals its hidden energy, it also grants the wielder to slash and cut the most toughest metal and rock or any other material, this is Ferdinand's treasured weapon he was keeping by himself, this was originally owned by his master and he later passed this to Ferdinand and kept it as his personal treasure, he rarely use this blade in battles and prefers fighting weaponless, this weapon is so sacred and he is keeping it all along he'll only use this of he to depending on any reason.

Description
The kodachi has a unique slanted design, it has a 15cm handle, a 58cm blade and a 61 cm scabbard, the kodachi usually can be holstered in back on the waist part, its scabbard has a blue decorative cord with tassels and tied on a bow knot the main colors of the kodachi's handle or hilt and its scabbard are both black and blue except its blade has a grayish black polish and blue sharp edges.

Notes:
The English meaning of its name is "cutting edge" in Japanese and its name "Saisentan" is written in Japanese Kanji shown on the pic